CN112977740A - Semi-submersible type hoisting and disassembling platform and control method thereof - Google Patents
Semi-submersible type hoisting and disassembling platform and control method thereof Download PDFInfo
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- CN112977740A CN112977740A CN202110068644.4A CN202110068644A CN112977740A CN 112977740 A CN112977740 A CN 112977740A CN 202110068644 A CN202110068644 A CN 202110068644A CN 112977740 A CN112977740 A CN 112977740A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
- B63B27/10—Arrangement of ship-based loading or unloading equipment for cargo or passengers of cranes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a semi-submersible type hoisting and disassembling platform and a control method thereof, wherein the platform comprises a port floating body, a starboard floating body, two port upright columns, two starboard upright columns and a deck box, wherein a plurality of common ballast water tanks and a plurality of rapid ballast water tanks are uniformly distributed in the port floating body and the starboard floating body, the tops of the rapid ballast water tanks are communicated with a compressed air ballast system, column-side ballast water tanks are respectively arranged in the port upright column and the starboard upright column, and the tops of the column-side ballast water tanks are communicated with the compressed air ballast system; the common ballast water tank, the rapid ballast water tank and the column-side ballast water tank are all provided with a water pump ballast system. The invention also discloses a control method of the platform. The invention ensures the safety of the platform and the working personnel to a great extent; a set of emergency response system is established, so that when the platform meets sudden failures in open sea operation, the platform operation command is smooth in real time, the emergency rescue is rapid and accurate, and the response of workers is orderly and safe.
Description
Technical Field
The invention relates to the field of marine equipment, in particular to a semi-submersible type hoisting and disassembling platform and a control method thereof.
Background
With the deep development of marine resources in China, various large marine structures are increasingly needed to deal with the severe sea conditions of deep ocean, and meanwhile, some offshore structures losing functions are also urgently needed to be disassembled and recycled.
CN201220358429.4 and CN201120024196.X jack-up work platform has the structural style of symmetrical overall arrangement, and the focus crane that is used for the lifting operation also arranges on the platform deck symmetrically, but when lifting off to large-scale, heavy structure spare and disassembling the operation, the stability of platform is difficult to obtain guaranteeing. The semi-submersible type hoisting and dismantling platform is used as a professional offshore hoisting and dismantling device, has wave response adjusting capacity which cannot be compared with that of a conventional hoisting platform (ship), and has a larger operation range and stronger operation capacity. The semi-submersible lifting platform described in the patent CN201110196551.6 is a semi-submersible lifting platform with an asymmetric structure, and has a certain effect on improving the stability of the platform, but does not relate to a stability control strategy and an emergency response processing method for the operation of the platform.
In addition, the conventional crane ship mostly works while balancing the ship body, the estimation and planning of the platform stability are lacked, and the safety of the operation is very worried. Meanwhile, the platform is often operated in the ocean, the ocean condition is severe, sudden failures such as collision and damage are easy to happen, and a set of complete emergency treatment measures are to be established urgently.
Disclosure of Invention
The invention aims to provide a semi-submersible type hoisting and disassembling platform and a control method thereof.
The technical scheme adopted by the invention is as follows:
the utility model provides a platform is disassembled in semi-submerged jack-up which characterized in that: the floating box comprises a floating box body, stand columns and a deck box which are arranged from bottom to top, wherein the floating box body is provided with a power system and a positioning control system, the floating box body comprises a port floating body and a starboard floating body, the stand columns comprise two port stand columns and two starboard stand columns, the port floating body is connected with the deck box through the two port stand columns, the starboard floating body is connected with the deck box through the two starboard stand columns, the bottom of the floating box body is provided with a full-rotation propeller, the top of the deck box is provided with a platform deck, the platform deck is provided with at least one full-rotation heavy crane and a telescopic trestle, the port floating body and the starboard floating body are mutually independent, common ballast water tanks and rapid ballast water tanks are uniformly arranged in the port floating body and the starboard floating body, the tops of the rapid ballast water tanks are communicated with a compressed air ballast system through pipelines with first control valves, and the volume of the starboard floating body is at least more than 1, the total volume of the rapid ballast water tank in the starboard float is more than 1.5 times of the total volume of the rapid ballast water tank in the port float, the full-rotation heavy cranes are all arranged on the side part of a platform deck corresponding to the port float, the port upright post and the starboard upright post are respectively provided with a column-side ballast water tank, the top of the column-side ballast water tank is communicated with a compressed air ballast system through a pipeline with a second control valve, the common ballast water tank, the rapid ballast water tank and the column-side ballast water tank are respectively provided with a water pump ballast system, the water pump ballast system comprises a water inlet and outlet pipeline with a water pump, the water inlet and outlet of the water inlet and outlet pipeline is positioned in sea water, the water inlet and outlet pipeline is provided with a sea bottom valve, and the bottoms of the rapid ballast water tank and the column-side ballast water tank are provided with a discharge pipeline with a discharge valve.
The number of the port upright columns and the number of the starboard upright columns are two respectively, and the volume of the starboard upright columns is larger than that of the port upright columns.
The transition cambered surfaces of the upright columns, the buoyancy tanks and the deck boxes are all single-sheet hyperboloid cambered plate transition and formed by hyperboloids
，a>0，b>0, formed by rotating around the symmetry axis, and satisfies the following curved surface equation:
(ii) a Wherein the real long axis length of the hyperbola is 2a, and the focal length of the hyperbola is 2 c; the length of the virtual axis of the hyperbola is 2 b;
。
two parking aprons are arranged at the positions of the bow and stern larms on the platform deck; a boat lifting frame and a plurality of lifeboats are uniformly arranged in the middle of the bow and the stern on the platform deck; a small crane is arranged on the port of the platform deck; a living area is arranged at the bow of the platform deck.
20 common water ballast tanks are uniformly arranged in the port floating body and the starboard floating body, 2 rapid water ballast tanks are arranged in the port floating body, and 4 rapid water ballast tanks are arranged in the starboard floating body.
The lower parts of the rapid ballast water tanks in the port floating body are sequentially communicated through a channel with a normally open valve, and the lower parts of the rapid ballast water tanks in the starboard floating body are sequentially communicated through a channel with a normally open valve.
And a ballast pipeline provided with a discharge valve is arranged between the column side ballast tank on the left side and the corresponding rapid ballast water tank on the left side, and a ballast pipeline provided with a discharge valve is arranged between the column side ballast tank on the right side and the corresponding rapid ballast water tank on the right side.
And the ballast pipelines are provided with reverse exhaust check valves.
A control method of a semi-submersible type hoisting and disassembling platform is characterized by comprising the following steps: the method comprises the following steps:
step 1: performing platform stability analysis: designing an operation form, establishing a hydrostatic model, analyzing a wind-tilting moment, and setting a stability criterion to obtain the stability criterion of the semi-submersible platform in the global sea area, namely an allowable vertical gravity center (AVCG) curve of the semi-submersible platform under different set operation conditions and different drafts;
step 2: pre-analysis of hoisting operation:
step 2-1: analyzing platform load and center of gravity: the load borne by the semi-submersible platform mainly comprises a fixed load and a variable load, the fixed load mainly refers to the mass of the platform and immovable equipment, namely the mass of an empty ship, the variable load mainly comprises deck load and fluid level change, and the specific load types are as follows:
(1) loading the empty ship: inquiring the quality according to the ship delivery detection report
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(2) Deck load: according to the actual ship condition, the external load including the hoisting,
Evaluating the fluid in the platform pipeline system, the temporarily stacked goods and consumables, the anchor and anchor chain, and the deck load information including the helicopter to obtain the quality
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(3) Tank weight and free level moment: the liquid tank mainly comprises a fuel oil tank, a lubricating oil tank, a fresh water tank and a ballast water tank, wherein a liquid level transmitter and an air blowing type liquid level meter are arranged in each liquid tank, the two liquid level measurement modes are mutually redundant and measure the liquid level in the liquid tank in real time; the nominal density of each fluid in each tank is recorded as
And the density of the liquid tank obtained by the actual measurement of the working personnel before each operation is recorded as
In different sea areasThe water salinity is measured by a seawater salinity meter; after the filling proportion or the water level of the fluid in the liquid tank is obtained, the volume of the fluid in each liquid tank is obtained
Calculating the longitudinal center of gravity of the fluid in the tank by linear interpolation
Transverse center of gravity
Vertical center of gravity
Free liquid level longitudinal moment
And free liquid level transverse moment
；
Weight in the liquid tank:
whereini= { fuel, lubricating oil, fresh water, seawater … };
actual free liquid level transverse moment of the liquid tank:
；
actual free liquid level longitudinal moment of the liquid tank:
；
(4) calculating the moment: the moment of the load of each component of the semi-submersible platform is calculated in the following way, wherein j = {0,1,2 }:
longitudinal moment:
；
transverse moment:
；
the vertical moment:
；
(5) calculating the total weight, the gravity center and the free liquid level correction:
the total mass is as follows:
wherein j = {0,1,2 };
total longitudinal center of gravity:
；
total transverse center of gravity:
；
the total vertical gravity center:
；
correction of total vertical center-of-gravity-transverse moment:
；
correcting the total vertical gravity center-longitudinal moment:
；
step 2-2: analyzing draft and transverse and longitudinal inclination angles:
(1) draft depth: according to the seawater salinity of the area obtained by measuring in the step 2-1 and the step 3
And the total mass calculated in the steps 2-1 (5)MBy linear interpolationThe longitudinal floating core of the platform is solvedLCBHorizontal floating coreTCBSagging and floating coreVCBLongitudinal and steady heartKMLStable heart and transverse movementKMTAnd draftD；
(2) Roll and pitch angles:
the transverse inclination angle:
；
pitch angle:
；
step 2-3: checking the allowable vertical center of gravity: according to the platform draft obtained in the step 2-2 (1)DSubstituting the allowable vertical gravity center curve of the global sea area semi-submersible platform obtained in the step 1 to obtain an allowable vertical gravity center value AVCG0 of the platform under the current sea area, the current working condition and the current draft, and verifying the AVCG 0; if the number of the first and second antennas is greater than the predetermined number,
if the current loading stress condition meets the safe operation condition of the platform, otherwise, the deck load arrangement mode in the step 2-1 (2) and the fluid distribution of the main liquid tanks, namely the ballast water tanks in the step 2-1 (3) are readjusted, and the platform can not continue to operate until the comparison condition is met;
and step 3: hoisting the platform: after the verification in the step 2 is passed, the platform starts to formally carry out hoisting operation;
firstly, opening drain valves of two column-side ballast water tanks in the starboard stand column, wherein the drain valves are positioned in the sea, and discharging ballast water of the starboard column-side ballast water tanks into the sea; the water pump ballast system is started for the two column side ballast water tanks in the port upright column, and the column side ballast water tanks of the port upright column are filled with water, so that the whole platform can quickly finish primary inclination towards the left side;
then, a drain valve of the rapid ballast water tank in the starboard floating body, which is positioned in the sea, is opened, the compressed air ballast system and a water pump ballast system of the rapid ballast water tank in the starboard floating body perform drainage work, and ballast water of the starboard rapid ballast water tank is discharged into the sea; the port rapid ballast water tank starts a water pump ballast system, and the port rapid ballast water tank feeds water to respectively discharge the starboard floating body ballast tank and feed water to the port floating body ballast tank so as to further realize inclination;
finally, finishing final fine adjustment of common ballast water tanks in the port and starboard floating bodies through a water pump ballast system; the inclination angle of the platform is determined according to the transverse inclination angle obtained in the step 2-2 (2)
Angle of inclination to pitch
Adjusting, and meanwhile, repeating the step 2 in real time according to the liquid level change condition of the current ballast water tank to ensure that the VT and VL of the platform meet the allowable vertical gravity center requirement of the platform, so that the platform meets the condition of safe operation;
in the hoisting operation process of the platform, according to the requirement of allowable vertical center of gravity, the distribution of the ballast water of the platform is adjusted through the compressed air ballast system, each water pump ballast system and the switch of the drain valve on the drain pipeline, so that the platform can meet the corresponding stability criterion all the time in the whole hoisting operation process to ensure the operation safety of the platform.
The operation process of the lifting operation of the platform comprises the following steps:
step 1: towing the platform to a target water area by using a towing ship according to the technology and the maritime requirements of the towing device;
step 2: moving the platform to a service radius range under a corresponding sea condition according to the position of a target module to be lifted;
and step 3: according to different working conditions and hoisting weights, the ballast system is utilized to adjust the platform to have draft within 22-26.4 meters of crane design service draft;
and 4, step 4: the trestle is mounted on the opposite module or platform, and the service personnel withdraw the trestle after the service personnel reach the operation area through the trestle and finish the hoisting preparation;
and 5: adjusting the marine crane to an operation position, namely within the service radius range of the crane, and well connecting and checking the rigging and the lifting appliance;
step 6: starting a crane to stably hoist the module to a platform deck and placing the module;
and 7: after the module is placed, the maritime work crane is separated from the module, and the crane is reset to the rest arm and is well fixed;
and 8: completing the process of hoisting one module, and repeating the step 2 to the step 8;
and step 9: after all the disassembling tasks are completed, the platform drives away from the working water area.
The invention has the advantages that: the platform is provided with a full-rotation heavy crane, so that the lifting capacity is excellent, and the working capacity of the platform is expanded; the platform is provided with the full-rotation propeller, so that the power positioning and motion performance is excellent, and the control precision is high; the platform is provided with a telescopic trestle, so that the vertical service angle and the axial service distance are enlarged. The bow part of the platform is provided with a large-capacity living area, so that a comfortable and safe living environment is provided for workers; the reinforced deck box design is adopted, so that the deck bearing capacity and the linear load of the bulkhead are improved, and conditions are provided for shipping large modules; the invention combines two ballast systems of water pump ballast and compressed air, and is provided with a plurality of rapid ballast tanks and a common ballast tank, thereby ensuring the rapid anti-tilting and load-adjusting speed during hoisting operation and meeting the requirements of platform stability and crane operation safety; meanwhile, in the emergency situation of hoisting operation, such as sudden loss of hoisting load, the ballast water for anti-tilt load adjustment in the upright post is quickly emptied by adopting compressed air, so that the tilt angle of the platform is reduced, and the safety of the platform operation is further improved; the double-machine-coupled monitoring and control can guarantee accurate lifting positioning under complex sea conditions, and when the ballast monitoring system is matched for combined monitoring, rapid ballast allocation and real-time adjustment can be effectively carried out, so that the safety and stability of the platform are guaranteed; according to the design and use requirements of the platform, the stability criterion of the platform global sea area operation is established, the loading condition of the platform is pre-analyzed, the stability requirement of the platform during operation in different sea areas, different drafts and different loads is met, and the safety of the platform and workers is greatly guaranteed; a set of emergency response system is established, and comprises an emergency control center, an emergency action group and an emergency operation flow, so that when the platform meets sudden failures in open sea operation, the platform operation command is smooth in real time, the emergency rescue is rapid and accurate, and the response of workers is orderly and safe.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a front view of a semi-submersible lifting and dismantling platform of the present invention;
FIG. 2 is a view of the bow of the semi-submersible lifting and dismantling platform of the present invention;
FIG. 3 is a step diagram of a control method of the semi-submersible lifting dismantling platform during operation;
FIG. 4 is a flow chart of the operation control of the hoisting operation of the semi-submersible hoisting and dismantling platform of the present invention.
Wherein: 1. a buoyancy tank; 101. a starboard float; 102. a port float; 2. a column; 201. starboard columns; 202. a port upright column; 3. a deck box; 4. parking apron; 5. a full-rotation heavy crane; 6. a small crane; 7. a platform deck; 8. a living area; 9. a telescopic trestle; 10. a boat davit; 11. a lifeboat; 12. a full-rotation propeller; 13. a column-side ballast tank; 14. a rapid ballast tank; 15. a common ballast tank.
Detailed Description
As shown in fig. 1-4, a semi-submersible lifting dismantling platform comprises a buoyancy tank 1, columns 2 and a deck box 3 which are arranged from bottom to top, wherein a power system and a positioning control system are arranged on the buoyancy tank 1, the buoyancy tank 1 comprises a port floating body 102 and a starboard floating body 101, the columns 2 comprise two port columns 202 and two starboard columns 201, the port floating body 102 is connected with the deck box 3 through the two port columns 202, the starboard floating body 101 is connected with the deck box 3 through the two starboard columns 201, a full-rotation propeller 12 is arranged at the bottom of the buoyancy tank 1, a platform deck 7 is arranged at the top of the deck box 3, at least one full-rotation heavy crane 5 and a telescopic trestle 9 are arranged on the platform deck 7, the port floating body 102 and the starboard floating body 101 are independent from each other, a common ballast water tank 15 and a rapid ballast water tank 14 are uniformly arranged in the port floating body 102 and the starboard floating body 101, the top of the rapid ballast water tank 14 is communicated with a compressed air system through a pipeline with a first control, the volume of the starboard floating body 101 is at least 1.5 times of the volume of the port floating body 102, the total volume of the rapid ballast water tanks 14 in the starboard floating body 101 is more than 1.5 times of the total volume of the rapid ballast water tanks 14 in the port floating body 102, the full-rotation heavy cranes 5 are all arranged at the side parts of the platform decks 7 corresponding to the port floating body 102, the port upright posts 202 and the starboard upright posts 201 are respectively provided with a column side ballast water tank 13, the tops of the column side ballast water tanks 13 are communicated with a compressed air ballast system through pipelines with second control valves, the common ballast water tanks 15, the rapid ballast water tank 14 and the column side ballast water tank 13 are both provided with a water pump ballast system, the water pump ballast system comprises a water inlet pipeline and a water outlet pipeline with a water pump, the water inlet and the water outlet of the water inlet pipeline and the water outlet pipeline are positioned in seawater, the water inlet pipeline and the water outlet pipeline are provided with a seabed valve, and the bottoms of the rapid ballast water tank 14 and the column side ballast water tank 13 are provided with a discharge pipeline with a discharge valve which is communicated into the sea.
Two port columns 202 and two starboard columns 201 are provided, and the volume of the starboard column 201 is larger than that of the port column 202.
The transition cambered surfaces of the upright posts 2, the buoyancy tanks 1 and the deck boxes 3 are all single-sheet hyperboloid cambered plate transition consisting of hyperboloids
，a>0，b>0, formed by rotating around the symmetry axis, and satisfies the following curved surface equation:
(ii) a Wherein the real long axis length of the hyperbola is 2a, and the focal length of the hyperbola is 2 c; the length of the virtual axis of the hyperbola is 2 b;
。
two parking aprons 4 are arranged on the platform deck 7 at the bow and stern port sides; a boat davit frame 10 and a plurality of lifeboats 11 are arranged in the middle of a bow and a stern on the platform deck 7; a small crane 6 is arranged on the port of the platform deck 7; a living area 8 is arranged at the bow of the platform deck 7.
20 common water ballast tanks 15 are uniformly arranged in the port floating body and the starboard floating body, 2 rapid water ballast tanks 14 are arranged in the port floating body 102, and 4 rapid water ballast tanks 14 are arranged in the starboard floating body 101.
The lower parts of the rapid ballast water tanks 14 in the port floating body 102 are sequentially communicated by adopting a channel with a normally open valve, and the lower parts of the rapid ballast water tanks 14 in the starboard floating body 101 are sequentially communicated by adopting a channel with a normally open valve.
Ballast pipelines provided with discharge valves are arranged between the left column side ballast tank 13 and the corresponding left rapid ballast water tank 14, and ballast pipelines provided with discharge valves are arranged between the right column side ballast tank 13 and the corresponding right rapid ballast water tank 14.
The ballast pipelines are all provided with a reverse exhaust check valve.
A control method of a semi-submersible type hoisting and disassembling platform comprises the following steps:
step 1: performing platform stability analysis: designing an operation form, establishing a hydrostatic model, analyzing a wind-tilting moment, and setting a stability criterion to obtain the stability criterion of the semi-submersible platform in the global sea area, namely an allowable vertical gravity center (AVCG) curve of the semi-submersible platform under different set operation conditions and different drafts;
step 2: pre-analysis of hoisting operation:
step 2-1: analyzing platform load and center of gravity: the load borne by the semi-submersible platform mainly comprises a fixed load and a variable load, the fixed load mainly refers to the mass of the platform and immovable equipment, namely the mass of an empty ship, the variable load mainly comprises deck load and fluid level change, and the specific load types are as follows:
(1) loading the empty ship: inquiring the quality according to the ship delivery detection report
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(2) Deck load: according to the actual ship condition, the external load including the hoisting,
Evaluating the fluid in the platform pipeline system, the temporarily stacked goods and consumables, the anchor and anchor chain, and the deck load information including the helicopter to obtain the quality
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(3) Tank weight and free level moment: the liquid tank mainly comprises a fuel oil tank, a lubricating oil tank, a fresh water tank and a ballast water tank, wherein a liquid level transmitter and an air blowing type liquid level meter are arranged in each liquid tank, the two liquid level measurement modes are mutually redundant and measure the liquid level in the liquid tank in real time; the nominal density of each fluid in each tank is recorded as
And the density of the liquid tank obtained by the actual measurement of the working personnel before each operation is recorded as
Wherein the salinity of the seawater in different sea areas is measured by a seawater salinity meter; after the filling proportion or the water level of the fluid in the liquid tank is obtained, the volume of the fluid in each liquid tank is obtained
Calculating the longitudinal center of gravity of the fluid in the tank by linear interpolation
Transverse center of gravity
Vertical center of gravity
Free liquid level longitudinal moment
And free liquid level transverse moment
；
Weight in the liquid tank:
whereini= { fuel, lubricating oil, fresh water, seawater … };
actual free liquid level transverse moment of the liquid tank:
；
actual free liquid level longitudinal moment of the liquid tank:
；
(4) calculating the moment: the moment of the load of each component of the semi-submersible platform is calculated in the following way, wherein j = {0,1,2 }:
longitudinal moment:
；
transverse moment:
；
the vertical moment:
；
(5) calculating the total weight, the gravity center and the free liquid level correction:
the total mass is as follows:
wherein j = {0,1,2 };
total longitudinal center of gravity:
；
total transverse center of gravity:
；
the total vertical gravity center:
；
correction of total vertical center-of-gravity-transverse moment:
；
correcting the total vertical gravity center-longitudinal moment:
；
step 2-2: analyzing draft and transverse and longitudinal inclination angles:
(1) draft depth: according to the seawater salinity of the area obtained by measuring in the step 2-1 and the step 3
And the total mass calculated in the steps 2-1 (5)MThe longitudinal floating center of the platform can be solved by linear interpolationLCBHorizontal floating coreTCBSagging and floating coreVCBLongitudinal and steady heartKMLStable heart and transverse movementKMTAnd draftD；
(2) Roll and pitch angles:
the transverse inclination angle:
；
pitch angle:
；
step 2-3: checking the allowable vertical center of gravity: according to the platform draft obtained in the step 2-2 (1)DSubstituting the allowable vertical gravity center curve of the global sea area semi-submersible platform obtained in the step 1 to obtain an allowable vertical gravity center value AVCG0 of the platform under the current sea area, the current working condition and the current draft, and verifying the AVCG 0; if the number of the first and second antennas is greater than the predetermined number,
if the current loading stress condition meets the safe operation condition of the platform, otherwise, the deck load arrangement mode in the step 2-1 (2) and the fluid distribution of the main liquid tanks, namely the ballast water tanks in the step 2-1 (3) are readjusted, and the platform can not continue to operate until the comparison condition is met;
and step 3: hoisting the platform: after the verification in the step 2 is passed, the platform starts to formally carry out hoisting operation;
firstly, opening drain valves of two column-side ballast water tanks in the starboard stand column, wherein the drain valves are positioned in the sea, and discharging ballast water of the starboard column-side ballast water tanks into the sea; the water pump ballast system is started for the two column side ballast water tanks in the port upright column, and the column side ballast water tanks of the port upright column are filled with water, so that the whole platform can quickly finish primary inclination towards the left side;
then, a drain valve of the rapid ballast water tank in the starboard floating body, which is positioned in the sea, is opened, the compressed air ballast system and a water pump ballast system of the rapid ballast water tank in the starboard floating body perform drainage work, and ballast water of the starboard rapid ballast water tank is discharged into the sea; the port rapid ballast water tank starts a water pump ballast system, and the port rapid ballast water tank feeds water to respectively discharge the starboard floating body ballast tank and feed water to the port floating body ballast tank so as to further realize inclination;
finally, finishing final fine adjustment of common ballast water tanks in the port and starboard floating bodies through a water pump ballast system; the inclination angle of the platform is determined according to the transverse inclination angle obtained in the step 2-2 (2)
Angle of inclination to pitch
Adjusting, and meanwhile, repeating the step 2 in real time according to the liquid level change condition of the current ballast water tank to ensure that the VT and VL of the platform meet the allowable vertical gravity center requirement of the platform, so that the platform meets the condition of safe operation;
in the hoisting operation process of the platform, according to the requirement of allowable vertical center of gravity, the distribution of the ballast water of the platform is adjusted through the compressed air ballast system, each water pump ballast system and the switch of the drain valve on the drain pipeline, so that the platform can meet the corresponding stability criterion all the time in the whole hoisting operation process to ensure the operation safety of the platform.
The operation process of the platform hoisting operation comprises the following steps:
step 1: towing the platform to a target water area by using a towing ship according to the technology and the maritime requirements of the towing device;
step 2: moving the platform to a service radius range under a corresponding sea condition according to the position of a target module to be lifted;
and step 3: according to different working conditions and hoisting weights, the ballast system is utilized to adjust the platform to have draft within 22-26.4 meters of crane design service draft;
and 4, step 4: the trestle is mounted on the opposite module or platform, and the service personnel withdraw the trestle after the service personnel reach the operation area through the trestle and finish the hoisting preparation;
and 5: adjusting the marine crane to an operation position, namely within the service radius range of the crane, and well connecting and checking the rigging and the lifting appliance;
step 6: starting a crane to stably hoist the module to a platform deck and placing the module;
and 7: after the module is placed, the maritime work crane is separated from the module, and the crane is reset to the rest arm and is well fixed;
and 8: completing the process of hoisting one module, and repeating the step 2 to the step 8;
and step 9: after all the disassembling tasks are completed, the platform drives away from the working water area.
The platform is provided with the full-rotation heavy crane, so that the lifting capacity is excellent, and the working capacity of the platform is expanded; the platform is provided with the full-rotation propeller, so that the power positioning and motion performance is excellent, and the control precision is high; the platform is provided with a telescopic trestle, so that the vertical service angle and the axial service distance are enlarged. The bow part of the platform is provided with a large-capacity living area, so that a comfortable and safe living environment is provided for workers; the reinforced deck box design is adopted, so that the deck bearing capacity and the linear load of the bulkhead are improved, and conditions are provided for shipping large modules; the invention combines two ballast systems of water pump ballast and compressed air, and is provided with a plurality of rapid ballast tanks and a common ballast tank, thereby ensuring the rapid anti-tilting and load-adjusting speed during hoisting operation and meeting the requirements of platform stability and crane operation safety; meanwhile, in the emergency situation of hoisting operation, such as sudden loss of hoisting load, the ballast water for anti-tilt load adjustment in the upright post is quickly emptied by adopting compressed air, so that the tilt angle of the platform is reduced, and the safety of the platform operation is further improved; the double-machine-coupled monitoring and control can guarantee accurate lifting positioning under complex sea conditions, and when the ballast monitoring system is matched for combined monitoring, rapid ballast allocation and real-time adjustment can be effectively carried out, so that the safety and stability of the platform are guaranteed; according to the design and use requirements of the platform, the stability criterion of the platform global sea area operation is established, the loading condition of the platform is pre-analyzed, the stability requirement of the platform during operation in different sea areas, different drafts and different loads is met, and the safety of the platform and workers is greatly guaranteed; a set of emergency response system is established, and comprises an emergency control center, an emergency action group and an emergency operation flow, so that when the platform meets sudden failures in open sea operation, the platform operation command is smooth in real time, the emergency rescue is rapid and accurate, and the response of workers is orderly and safe.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should be included in the protection scope defined by the claims of the present invention.
Claims (10)
1. The utility model provides a platform is disassembled in semi-submerged jack-up which characterized in that: the floating box comprises a floating box body, stand columns and a deck box which are arranged from bottom to top, wherein the floating box body is provided with a power system and a positioning control system, the floating box body comprises a port floating body and a starboard floating body, the stand columns comprise two port stand columns and two starboard stand columns, the port floating body is connected with the deck box through the two port stand columns, the starboard floating body is connected with the deck box through the two starboard stand columns, the bottom of the floating box body is provided with a full-rotation propeller, the top of the deck box is provided with a platform deck, the platform deck is provided with at least one full-rotation heavy crane and a telescopic trestle, the port floating body and the starboard floating body are mutually independent, common ballast water tanks and rapid ballast water tanks are uniformly arranged in the port floating body and the starboard floating body, the tops of the rapid ballast water tanks are communicated with a compressed air ballast system through pipelines with first control valves, and the volume of the starboard floating body is at least more than 1, the total volume of the rapid ballast water tank in the starboard float is more than 1.5 times of the total volume of the rapid ballast water tank in the port float, the full-rotation heavy cranes are all arranged on the side part of a platform deck corresponding to the port float, the port upright post and the starboard upright post are respectively provided with a column-side ballast water tank, the top of the column-side ballast water tank is communicated with a compressed air ballast system through a pipeline with a second control valve, the common ballast water tank, the rapid ballast water tank and the column-side ballast water tank are respectively provided with a water pump ballast system, the water pump ballast system comprises a water inlet and outlet pipeline with a water pump, the water inlet and outlet of the water inlet and outlet pipeline is positioned in sea water, the water inlet and outlet pipeline is provided with a sea bottom valve, and the bottoms of the rapid ballast water tank and the column-side ballast water tank are provided with a discharge pipeline with a discharge valve.
2. The semi-submersible lifting dismantling platform of claim 1, wherein: the number of the port upright columns and the number of the starboard upright columns are two respectively, and the volume of the starboard upright columns is larger than that of the port upright columns.
3. The semi-submersible lifting dismantling platform of claim 1, wherein: the transition cambered surfaces of the upright columns, the buoyancy tanks and the deck boxes are all single-sheet hyperboloid cambered plate transition and formed by hyperboloids
，a>0，b>0, formed by rotating around the symmetry axis, and satisfies the following curved surface equation:
(ii) a Wherein the real long axis length of the hyperbola is 2a, and the focal length of the hyperbola is 2 c; the length of the virtual axis of the hyperbola is 2 b;
。
4. the semi-submersible lifting dismantling platform of claim 1, wherein: two parking aprons are arranged at the positions of the bow and stern larms on the platform deck; a boat lifting frame and a plurality of lifeboats are uniformly arranged in the middle of the bow and the stern on the platform deck; a small crane is arranged on the port of the platform deck; a living area is arranged at the bow of the platform deck.
5. The semi-submersible lifting dismantling platform of claim 1, wherein: 20 common water ballast tanks are uniformly arranged in the port floating body and the starboard floating body, 2 rapid water ballast tanks are arranged in the port floating body, and 4 rapid water ballast tanks are arranged in the starboard floating body.
6. The semi-submersible lifting dismantling platform of claim 5, wherein: the lower parts of the rapid ballast water tanks in the port floating body are sequentially communicated through a channel with a normally open valve, and the lower parts of the rapid ballast water tanks in the starboard floating body are sequentially communicated through a channel with a normally open valve.
7. The semi-submersible lifting dismantling platform of claim 1 or 5, wherein: and a ballast pipeline provided with a discharge valve is arranged between the column side ballast tank on the left side and the corresponding rapid ballast water tank on the left side, and a ballast pipeline provided with a discharge valve is arranged between the column side ballast tank on the right side and the corresponding rapid ballast water tank on the right side.
8. The semi-submersible lifting dismantling platform of claim 7, wherein: and the ballast pipelines are provided with reverse exhaust check valves.
9. The method for controlling a semi-submersible crane dismantling platform according to any of claims 1 to 8, wherein: the method comprises the following steps:
step 1: performing platform stability analysis: designing an operation form, establishing a hydrostatic model, analyzing a wind-tilting moment, and setting a stability criterion to obtain the stability criterion of the semi-submersible platform in the global sea area, namely an allowable vertical gravity center (AVCG) curve of the semi-submersible platform under different set operation conditions and different drafts;
step 2: pre-analysis of hoisting operation:
step 2-1: analyzing platform load and center of gravity: the load borne by the semi-submersible platform mainly comprises a fixed load and a variable load, the fixed load mainly refers to the mass of the platform and immovable equipment, namely the mass of an empty ship, the variable load mainly comprises deck load and fluid level change, and the specific load types are as follows:
(1) loading the empty ship: according to ship delivery detection reportInquire about its quality
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(2) Deck load: according to the actual ship condition, the external load including the hoisting,
Evaluating the fluid in the platform pipeline system, the temporarily stacked goods and consumables, the anchor and anchor chain, and the deck load information including the helicopter to obtain the quality
Longitudinal center of gravity
Transverse center of gravity
Vertical center of gravity
；
(3) Tank weight and free level moment: the liquid tank mainly comprises a fuel oil tank, a lubricating oil tank, a fresh water tank and a ballast water tank, wherein a liquid level transmitter and an air blowing type liquid level meter are arranged in each liquid tank, the two liquid level measurement modes are mutually redundant and measure the liquid level in the liquid tank in real time; the nominal density of each fluid in each tank is recorded as
Before each operation, the staffThe density of the tank obtained by actual measurement is recorded as
Wherein the salinity of the seawater in different sea areas is measured by a seawater salinity meter; after the filling proportion or the water level of the fluid in the liquid tank is obtained, the volume of the fluid in each liquid tank is obtained
Calculating the longitudinal center of gravity of the fluid in the tank by linear interpolation
Transverse center of gravity
Vertical center of gravity
Free liquid level longitudinal moment
And free liquid level transverse moment
；
Weight in the liquid tank:
whereini= { fuel, lubricating oil, fresh water, seawater … };
actual free liquid level transverse moment of the liquid tank:
；
actual free liquid level longitudinal moment of the liquid tank:
；
(4) calculating the moment: the moment of the load of each component of the semi-submersible platform is calculated in the following way, wherein j = {0,1,2 }:
longitudinal moment:
；
transverse moment:
；
the vertical moment:
；
(5) calculating the total weight, the gravity center and the free liquid level correction:
the total mass is as follows:
wherein j = {0,1,2 };
total longitudinal center of gravity:
；
total transverse center of gravity:
；
the total vertical gravity center:
；
correction of total vertical center-of-gravity-transverse moment:
；
correcting the total vertical gravity center-longitudinal moment:
；
step 2-2: analyzing draft and transverse and longitudinal inclination angles:
(1) draft depth: according to the seawater salinity of the area obtained by measuring in the step 2-1 and the step 3
And the total mass calculated in the steps 2-1 (5)MThe longitudinal floating center of the platform can be solved by linear interpolationLCBHorizontal floating coreTCBSagging and floating coreVCBLongitudinal and steady heartKMLStable heart and transverse movementKMTAnd draftD；
(2) Roll and pitch angles:
the transverse inclination angle:
；
pitch angle:
；
step 2-3: checking the allowable vertical center of gravity: according to the platform draft obtained in the step 2-2 (1)DSubstituting the allowable vertical gravity center curve of the global sea area semi-submersible platform obtained in the step 1 to obtain an allowable vertical gravity center value AVCG0 of the platform under the current sea area, the current working condition and the current draft, and verifying the AVCG 0; if the number of the first and second antennas is greater than the predetermined number,
if the current loading stress condition meets the safe operation condition of the platform, otherwise, the deck load arrangement mode in the step 2-1 (2) and the fluid distribution of the main liquid tanks, namely the ballast water tanks in the step 2-1 (3) are readjusted, and the platform can not continue to operate until the comparison condition is met;
and step 3: hoisting the platform: after the verification in the step 2 is passed, the platform starts to formally carry out hoisting operation;
firstly, opening drain valves of two column-side ballast water tanks in the starboard stand column, wherein the drain valves are positioned in the sea, and discharging ballast water of the starboard column-side ballast water tanks into the sea; the water pump ballast system is started for the two column side ballast water tanks in the port upright column, and the column side ballast water tanks of the port upright column are filled with water, so that the whole platform can quickly finish primary inclination towards the left side;
then, a drain valve of the rapid ballast water tank in the starboard floating body, which is positioned in the sea, is opened, the compressed air ballast system and a water pump ballast system of the rapid ballast water tank in the starboard floating body perform drainage work, and ballast water of the starboard rapid ballast water tank is discharged into the sea; the port rapid ballast water tank starts a water pump ballast system, and the port rapid ballast water tank feeds water to respectively discharge the starboard floating body ballast tank and feed water to the port floating body ballast tank so as to further realize inclination;
finally, finishing final fine adjustment of common ballast water tanks in the port and starboard floating bodies through a water pump ballast system; the inclination angle of the platform is determined according to the transverse inclination angle obtained in the step 2-2 (2)
Angle of inclination to pitch
Adjusting, and meanwhile, repeating the step 2 in real time according to the liquid level change condition of the current ballast water tank to ensure that the VT and VL of the platform meet the allowable vertical gravity center requirement of the platform, so that the platform meets the condition of safe operation;
in the hoisting operation process of the platform, according to the requirement of allowable vertical center of gravity, the distribution of the ballast water of the platform is adjusted through the compressed air ballast system, each water pump ballast system and the switch of the drain valve on the drain pipeline, so that the platform can meet the corresponding stability criterion all the time in the whole hoisting operation process to ensure the operation safety of the platform.
10. The control method of the semi-submersible crane dismantling platform of claim 9, wherein: the operation process of the lifting operation of the platform comprises the following steps:
step 1: towing the platform to a target water area by using a towing ship according to the technology and the maritime requirements of the towing device;
step 2: moving the platform to a service radius range under a corresponding sea condition according to the position of a target module to be lifted;
and step 3: according to different working conditions and hoisting weights, the ballast system is utilized to adjust the platform to have draft within 22-26.4 meters of crane design service draft;
and 4, step 4: the trestle is mounted on the opposite module or platform, and the service personnel withdraw the trestle after the service personnel reach the operation area through the trestle and finish the hoisting preparation;
and 5: adjusting the marine crane to an operation position, namely within the service radius range of the crane, and well connecting and checking the rigging and the lifting appliance;
step 6: starting a crane to stably hoist the module to a platform deck and placing the module;
and 7: after the module is placed, the maritime work crane is separated from the module, and the crane is reset to the rest arm and is well fixed;
and 8: completing the process of hoisting one module, and repeating the step 2 to the step 8;
and step 9: after all the disassembling tasks are completed, the platform drives away from the working water area.
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| CN202110068644.4A Active CN112977740B (en) | 2020-12-04 | 2021-01-19 | Semi-submersible type hoisting and disassembling platform and control method thereof |
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| WO2022116823A1 (en) | 2022-06-09 |
| CN113636026A (en) | 2021-11-12 |
| CN112977740B (en) | 2022-04-01 |
| CN113636026B (en) | 2022-05-20 |
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